Malicious PDF — malware analysis report

Static analysis result for SHA-256 4571ea5cbc24436d…

MALICIOUS

PDF

89.6 KB Created: 2021-05-21 06:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5f8e40643212e6c56a87bb631e12628d SHA-1: 2f21563e7aaf91c64dc5beb598c563aa2bc98735 SHA-256: 4571ea5cbc24436d894a47c13be9e00e5ada05d4f4cdea838f6e5ccad121bf16
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing (WhatsApp) and a link farm on disposable hosting. The ML classifier also returned a high probability of maliciousness. The document body, though heavily obfuscated, contains references to "Flipkart hack mod apk download 2021", suggesting a lure for potentially malicious software or phishing. The embedded URLs point to redirectors and link farms, indicating a multi-stage attack designed to obscure the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://dedutosaku.weebly.com/uploads/1/3/4/8/134852257/mojujur-reribawadipufa-wotoboraz-galevugogewuz.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=flipkart+hack+mod+apk+download+2021 PDF link annotation
    • https://dedutosaku.weebly.com/uploads/1/3/4/8/134852257/mojujur-reribawadipufa-wotoboraz-galevugogewuz.pdfIn PDF document text
    • https://jizenovu.weebly.com/uploads/1/3/4/6/134682428/5570992.pdfIn PDF document text
    • https://moninedowilex.weebly.com/uploads/1/3/1/4/131436981/379477.pdfIn PDF document text
    • https://ramujodavuratot.weebly.com/uploads/1/3/4/6/134667495/6651032.pdfIn PDF document text
    • https://gapepaweduli.weebly.com/uploads/1/3/5/4/135400658/6877492.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/jefokukom.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/ginif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55df0d4b-0984-4bc8-8baa-c2d6d4ec6ba1/bass_guitar_chord_chart_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f5d6b5-8e50-4a8a-ad3f-d4fc0ab963af/jafatafunuwolotuligawuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af06ffc-fd4a-42c0-9545-6c21d8628f53/kenmore_350_series_water_softener_bypass_valve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd83918e-29d2-4de6-ab13-a3fa55914622/how_to_fix_alto_saxophone_leaks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb0f881-e64c-415e-984e-e69e4832ab19/pathfinder_npc_codex_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23222b7c-949d-4f60-b679-808e72cc0d36/shakespeare_sonnet_18_analysis_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed2f73d-8756-4ae2-845b-1142e4a8bbcc/75754916144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4794965-30cd-4dc7-bc36-fbff5d5f3988/how_many_calories_in_a_tomato_basil_tuna_wrap_from_subway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f5e07f-86a9-4eaf-bbb1-51ddfca6bdd5/37009627041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ce5109-15c2-4aaa-a9c1-22d053949eb1/how_to_get_a_new_york_drivers_license_from_out_of_state.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 5572 bytes
SHA-256: 660aa0143b6f8cd0d9366eb52199a7db1b2a2920b6a0cfbf6eab1248b6c3b7b1
font_01_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 11816 bytes
SHA-256: 0e5da6b3b540b3af403ce6251aed05727f2e3315c940aef6ef8f5f34de3d0784
font_02_sfnt_off0001413a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413A 16408 bytes
SHA-256: ff5762cf5582cc3ecef76bab81d0321294df6d989bf7ab806e7d0f0fc5e0e7f8

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